Siemens S7-1200 System Manual page 723
Hide thumbs
Also See for S7-1200:
- Operating instructions manual (132 pages) ,
- Programming manualline (74 pages) ,
- Manual (46 pages)
Table of Contents
Communication errors (STATUS = 16#818B) are only reported on the USS_PORT
instruction and not on the USS_DRV instruction. For example, if the network is not properly
terminated then it is possible for a drive to go to RUN but the USS_DRV instruction will show
all 0's for the output parameters. In this case, you can only detect the communication error
on the USS_PORT instruction. Since this error is only visible for one scan, you will need to
add some capture logic as illustrated in the following example. In this example, when the
error bit of the USS_PORT instruction is TRUE, then the STATUS and the
USS_Extended_Error values are saved into M memory. The drive number is placed in
USS_Extended_Error variable when the STATUS code value is hexadecimal 8180, 8184,
8187, or 818B.
USS drives support read and write access to a drive's internal parameters. This feature
allows remote control and configuration of the drive. Drive parameter access operations can
fail due to errors such as values out of range or illegal requests for a drive's current mode.
The drive generates an error code value that is returned in the "USS_Extended_Error"
variable. This error code value is only valid for the last execution of a USS_RPM or
USS_WPM instruction. The drive error code is put into USS_Extended_Error variable when
the STATUS code value is hexadecimal 818C. The error code value of
"USS_Extended_Error" depends on the drive model. See the drive's manual for a description
of the extended error codes for read and write parameter operations.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
Communication processor and Modbus TCP
12.4 Universal serial interface (USS) communication
Network 1 "PortStatus" port status and
"USS_DRV_DB".USS_Extended_Error
extended error code values are only
valid for one program scan. The
values must be captured for later
processing.
Network 2 The "PortError" contact
triggers the storage of the "PortStatus"
value in "LastPortStatus" and the
"USS_DRV_DB".USS_Extended_Error
value in "LastExtError".
723
Table of Contents
